The watch costed $400 before the discount.
76 * 100 = 7,600
7,600 / 19 = 400
Answer: Regression line equation: 
Step-by-step explanation:
Equation of least-squares regression line for predicting y :

, where
, 
Given: 
Then,

Now,

Then, Regression line equation: 
Could it be an Imaginary number?
Answer:
600 acres
Step-by-step explanation:
Hope this helps!